Victorian Fossils. 



Fam. SPONDYLIDAE. 



Genus Spondylus, Linne. 

 Spondylus baileyana, sp. nov. (Plate II., Fig. 11.) 



Description. — Valves roundly to obliquely ovate; left valve de- 

 pressed, right valve moderately convex. Shell thinner than in 8. 

 gaederopoides, McCoy. Hinge-line moderately long for the genus. An- 

 terior margin of the shell widely rounded, curving obliquely to the 

 ventral margin, and broadly rounded at the posterior angle. Surface 

 of shell ornamented with about 6 principal radii, which are more 

 than usually adpressed to the shell, but at intervals projecting into 

 sharp spines, more strongly developed towards the posterior extremity. 

 Smaller and almost obsolete radii between the stronger ones. Growth- 

 lines faint except towards the ventral margin of full-grown specimens; 

 never developing further than as a series of depressed lamellae. Inner 

 surface with the margin finely toothed. Muscle impression large, 

 situated close to the umbo. 



Dimensions. — Type specimen, left valve. Length, 74 mm.; height, 

 82 mm. 



Observations. — This species is clearly the ancestral form of the 

 living S. tenellus. Reeve, n which is found off New South Wales and 

 Victoria (Western Port, Phillip Island and Portland). The fossil 

 specimen is fully twice the height, with more widely spaced radii 

 and stronger and more adpressed spines. The Kalimnan Spondylus 

 spondyliolcides (or arenicola) , Tate sp.,12 from the Upper beds at the 

 Murray Cliffs is distinguished by the more triangular shape and more 

 spinous character, with obliteration of the concentric lamellae. 



Occurrence. — In calcareous shelly marl, Beaumaris, Port Phillip. 

 Collected by the late J. A. Bailey, after whom the species is named. 

 Also in the Dennant collection, from Rose Hill, near Bairnsdale, 

 and from McDonald's, Muddy Creek (F.C.). 



Age. — Kalimnan (Lower Pliocene). 



Order PRIONODESMACEA (Dysodonta). 

 Fam. MYTILIDAE. 



Genus Modiolus, Lamarck. 

 Modiolus mooraboolensis, sp., nov. (Plate III., Fig. 17.) 



Description. — Shell ovate, oblique, very tumid. Umbo small, incurved r 

 a comparatively sharp umbonal ridge extending from beak to near the 

 ventral margin, where it forms a broadly convex arch at the posterior 



11. Reeve, Conch. Icon., vol. ix., pi. xviii., fig 67. 



12. Trans Roy. Soc., S. Australia, vol. viii., 1886, p. 19, pi. iv., fig. 6, asf 

 Pecten spondijlioides. Renamed by Tate, 1896, in Rep. Australasian Asso- 

 ciation for the Advancement of Science, vol. vi., p. 318 as Spondylus areni- 

 Oola. Although inappropriate, this earlier trivial name must stand, accord- 

 ing to the rules of nomenclature. 



